Flat hair iron



FIG. 1 is a perspective view of a design according to the present invention;

FIG. 2 is a left side elevation view of the design according to the present invention;

FIG. 3 is a top plan view of the design according to the present invention;

FIG. 4 is a bottom plan view of the design according to the present invention;

FIG. 5 is a right side elevation view of the design according to the present invention;

FIG. 6 is a front elevation view of design according to the present invention;

FIG. 7 is a rear elevation view of the design according to the present invention; and,

FIG. 8 is a perspective view of a design according to the present invention.

The dotted lines in the drawings are environmental only and do not form any part of the claimed design. 

The ornamental design for a flat hair iron, as shown and described. 